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Nuclear Theory·nucl-th

Thursday·January 21, 2021

7 papers—5 primary·2 cross-listed

All7Primary5Cross-lists2
  1. 01

    [Submitted on 19 Jan 2021]

    Tasting Nuclear Pasta Made with Classical Molecular Dynamics Simulations

    Bao-An Li🇺🇸

    Nuclear clusters or voids in the inner crust of neutron stars were predicted to have various shapes collectively nicknamed nuclear pasta. The recent review in Ref. \cite{Lopez1} by López, Dorso and Frank summarized their systematic investigations into properties especially the morphological and thermodynamical phase transitions of the nuclear pasta within a Classical Molecular Dynamics model, providing further stimuli to find more observational evidences of the predicted nuclear pasta in neutron stars.

    Comments:
    Invited View & Perspective
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex)
    arXiv:
    2101.07843 [pdf]
    Front.Phys.(Beijing)(2021)·2 citations
  2. 02

    [Submitted on 20 Jan 2021]

    Editorial: The Future of Nuclear Structure: Challenges and Opportunities in the Microscopic Description of Nuclei

    Luigi Coraggio · Saori Pastore · Carlo Barbieri

    The past two decades have witnessed tremendous progress in the microscopic description of atomic nuclei. The Topical Review `The Future of Nuclear Structure' aims at summarizing the current state-of-the-art microscopic calculations in Nuclear Theory and to give a useful reference for young researches who wish to learn more about this exciting discipline.

    Comments:
    Editorial for a Topical Review on ab initio nuclear theory being published on FRONTIERS in Physics; accepted version (in print)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2101.07915 [pdf]
    Front.in Phys.(2021)·10 citations
  3. 03

    [Submitted on 20 Jan 2021]

    Nuclear Resonances, Scattering and Reactions from First Principles: Progress and Prospects

    Sofia Quaglioni🇺🇸 · Petr Navratil🇨🇦

    We present a brief overview of recent developments in ab initio calculations of nuclear scattering and reactions with a focus on applications of the no-core shell model with continuum method.

    Comments:
    9 pages, 7 figures (one more figure than in the published version)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2101.07921 [pdf]
    Nucl.Phys.News(2020)·6 citations
  4. 04

    [Submitted on 20 Jan 2021]

    Extensive Studies of the Neutron Star Equation of State from the Deep Learning Inference with the Observational Data Augmentation

    Yuki Fujimoto🇯🇵 · Kenji Fukushima🇯🇵 · Koichi Murase🇨🇳

    We discuss deep learning inference for the neutron star equation of state (EoS) using the real observational data of the mass and the radius. We make a quantitative comparison between the conventional polynomial regression and the neural network approach for the EoS parametrization. For our deep learning method to incorporate uncertainties in observation, we augment the training data with noise fluctuations corresponding to observational uncertainties. Deduced EoSs can accommodate a weak first-order phase transition, and we make a histogram for likely first-order regions. We also find that our observational data augmentation has a byproduct to tame the overfitting behavior. To check the performance improved by the data augmentation, we set up a toy model as the simplest inference problem to recover a double-peaked function and monitor the validation loss. We conclude that the data augmentation could be a useful technique to evade the overfitting without tuning the neural network architecture such as inserting the dropout.

    Comments:
    45 pages, 25 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Instrumentation and Methods for Astrophysics (astro-ph.IM); Machine Learning (cs.LG); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2101.08156 [pdf]
    JHEP(2021)·76 citations
  5. 05

    [Submitted on 20 Jan 2021]

    A mathematical model to describe the alpha dose rate from a UO2 surface

    Angus Siberry · David Hambley · Anna Adamska · Ross Springell

    A model to determine the dose rate of a planar alpha-emitting surface, has been developed. The approach presented is a computationally efficient mathematical model using stopping range data from the Stopping Ranges of Ions in Matter (SRIM) software. The alpha dose rates as a function of distance from irradiated UO2 spent fuel surfaces were produced for bench-marking with previous modelling attempts. This method is able to replicate a Monte Carlo (MCNPX) study of an irradiated UO2 fuel surface within 0.6 % of the resulting total dose rate and displays a similar dose profile.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2101.08174 [pdf]
    Radiat.Phys.Chem.(2021)·1 citation
  6. 06

    [Submitted on 19 Jan 2021] (cross-list from hep-ph)

    Combined Constraints on First Generation Leptoquarks

    Andreas Crivellin · Dario Müller · Luc Schnell

    In this article we perform a combined analysis of low energy precision constraints and LHC searches for leptoquarks which couple to first generation fermions. Considering all ten leptoquark representations, five scalar and five vector ones, we study at the precision frontier the constraints from , , and mixing, as well as from experiments searching for parity violation (APV and QWEAK). We include LHC searches for -channel single resonant production, pair production and Drell-Yan-like signatures of leptoquarks. Interestingly, we find that the recent non-resonant di-lepton analysis of ATLAS provides stronger bounds than the resonant searches recasted so far to constrain -channel production of leptoquarks. Taking into account all these bounds, we observe that none of the leptoquark representations can address the so-called "Cabibbo angle anomaly" via a direct contribution to super-allowed beta decays.

    Comments:
    12 pages, 3 figures, 2 tables, missing factor 2 in non-resonant ATLAS bounds corrected
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2101.07811 [pdf]
    Phys. Rev. D 103, 115023 (2021)
  7. 07

    [Submitted on 20 Jan 2021] (cross-list from hep-ph)

    Renormalization group improved pressure for hot and dense quark matter

    Jean-Loïc Kneur🇫🇷 · Marcus Benghi Pinto🇧🇷 · Tulio E. Restrepo🇧🇷

    We apply the renormalization group optimized perturbation theory (RGOPT) to evaluate the quark contribution to the QCD pressure at finite temperatures and baryonic densities, at next-to-leading order (NLO). Our results are compared to NLO and state-of-the-art higher orders of standard perturbative QCD (pQCD) and hard thermal loop perturbation theory (HTLpt). The RGOPT resummation provides a nonperturbative approximation, exhibiting a drastically better remnant renormalization scale dependence than pQCD, thanks to built-in renormalization group invariance consistency. At NLO, upon simply adding to the RGOPT-resummed quark contributions the purely perturbative NLO glue contribution, our results show a remarkable agreement with ab initio lattice simulation data for temperatures , with a remnant scale dependence drastically reduced as compared to HTLpt.

    Comments:
    24 pages, 17 figures. v2: some clarifications + 2 figures + references added. To appear in Phys. Rev. D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2101.08240 [pdf]
    PRD(2021)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE